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UltravioletPhotography

Think Your Hands are Clean ?


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So you think your hands are clean.....

I had washed my hands a few times this afternoon & had dinner, now eight hours later the message is still there !

VIS light induced IR Fluorescence has revealed a note I wrote on my hand eight hours earlier & I can't see a trace of ink on my palm.

https://www.flickr.c...06/14942320994/

Col

 

EDITOR: I've added the photo here - and given Col more posting space (see message below).

Flickr links don't always seem to work well for some reason.

 

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Col, I added you to the Members+ group so that you have more posting space.

We are happy to do that for anyone else who has reached the initial posting limit.

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HI everyone

The latest sequence of the grubby mits in IR Fluoro.

I wrote on my hand in blue biro at 10:20am, then the first washing, 11 hours later at 9:30pm, after further washing I took the Visible induced IR Fluorescence shot of my hand & lastly the bare hand in VIS light, showing no visible biro ink to my eye.

Cheers

Col

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I'll do it now Bjorn

Col

 

My now famous hand in IR light, the same filters on the camera as before, 720-780nm. The light source the same 24watt Mercury vapor HID flashlight, this time unfiltered.

Cheers

Col

 

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I promise this will be the last of my paw......unless by popular demand, I am requested to return :D

20 32 hours later the biro ink is still readable on my hand, in Visible Light induced Infrared Fluorescence.

Cheers

Col

 

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Nice hands Colin, I see a great fortune and prosperity in your future! But beware as not everything is gold that shines! <- isn't it what all the fortune tellers say all the time? :D

 

Have you tried different inks? It would be interesting to find out if all inks act like this or only certain type.

 

Ps.: It's fun to see you use biro for ballpen... Biro means Judge in hungarian, and it was the family name of the inventor Laszlo Biro (Leslie Judge :D)

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Thanks Peter

Thanks for Mr Biro's story too.

I called it a biro as I thought it would be more likely to be internationally recognized what I was talking about.

Col

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enricosavazzi
"Biro" is one of the two common terms in use in Italy. The other translates to "ballpoint pen". In Sweden, only an equivalent of the latter term is used. The Japanese use a shortened version of the Americal term (boorupen). I am told, however, that "biro" is common in the UK and Australia.
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